Structure and properties of small molecule-polymer blend semiconductors for organic thin film transistors

被引：221

作者：

Kang, Jihoon ^{[2
]}

Shin, Nayool ^{[2
]}

Jang, Do Young ^{[2
]}

Prabhu, Vivek M. ^{[1
]}

Yoon, Do Y. ^{[2
]}

机构：

[1] Natl Inst Stand & Technol, Div Polymers, Gaithersburg, MD 20899 USA

[2] Seoul Natl Univ, Dept Chem, Seoul 151747, South Korea

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 37期

关键词：

D O I：

10.1021/ja804013n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A comprehensive structural and electrical characterization of solution-processed blend films of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) semiconductor and poly(alpha-methylstyrene) (P alpha MS) insulator was performed to understand and optimize the blend semiconductor films, which are very attractive as the active layer in solution-processed organic thin-film transistors (OTFTs). Our study, based on careful measurements of specular neutron reflectivity and grazing-incidence X-ray diffraction, showed that the blends with a low molecular-mass P alpha MS exhibited a strong segregation of TIPS-pentacene only at the air interface, but surprisingly the blends with a high molecular-mass P alpha MS showed a strong segregation of TIPS-pentacene at both air and bottom substrate interfaces with high crystallinity and desired orientation. This finding led to the preparation of a TIPS-pentacene/P alpha MS blend active layer with superior performance characteristics (field-effect mobility, on/off ratio, and threshold voltage) over those of neat TIPS-pentacene, as well as the solution-processability of technologically attractive bottom-gate/bottom-contact OTFT devices.

引用

页码：12273 / +

页数：5

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